EP0262999B1 - Load-sensitive brake valve for a vehicle - Google Patents

Load-sensitive brake valve for a vehicle Download PDF

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Publication number
EP0262999B1
EP0262999B1 EP87401938A EP87401938A EP0262999B1 EP 0262999 B1 EP0262999 B1 EP 0262999B1 EP 87401938 A EP87401938 A EP 87401938A EP 87401938 A EP87401938 A EP 87401938A EP 0262999 B1 EP0262999 B1 EP 0262999B1
Authority
EP
European Patent Office
Prior art keywords
corrector
vehicle
suspension element
suspension
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP87401938A
Other languages
German (de)
French (fr)
Other versions
EP0262999A1 (en
Inventor
Franck Bequet
Roland Levrai
Jean-Charles Maligne
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bendix France SA
Original Assignee
Bendix France SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from FR8613075A external-priority patent/FR2604135B1/en
Application filed by Bendix France SA filed Critical Bendix France SA
Publication of EP0262999A1 publication Critical patent/EP0262999A1/en
Application granted granted Critical
Publication of EP0262999B1 publication Critical patent/EP0262999B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
    • B60G15/02—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring
    • B60G15/06—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper
    • B60G15/062—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper the spring being arranged around the damper
    • B60G15/063—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper the spring being arranged around the damper characterised by the mounting of the spring on the damper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/18—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to vehicle weight or load, e.g. load distribution
    • B60T8/1837—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to vehicle weight or load, e.g. load distribution characterised by the load-detecting arrangements
    • B60T8/1856—Arrangements for detecting suspension spring load
    • B60T8/1868—Arrangements for detecting suspension spring load comprising sensors of the type providing a mechanical output signal representing the load on the vehicle suspension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/30—Spring/Damper and/or actuator Units
    • B60G2202/31—Spring/Damper and/or actuator Units with the spring arranged around the damper, e.g. MacPherson strut
    • B60G2202/312—The spring being a wound spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/12—Mounting of springs or dampers
    • B60G2204/124—Mounting of coil springs
    • B60G2204/1242—Mounting of coil springs on a damper, e.g. MacPerson strut
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/60—Load
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
    • B60G2800/01—Attitude or posture control
    • B60G2800/019—Inclination due to load distribution or road gradient
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
    • B60G2800/22—Braking, stopping

Definitions

  • the present invention relates to braking correctors, and more particularly to such a corrector controlled by the load of a vehicle, according to the preamble of claim 1.
  • Document GB-A-1 577 029 discloses a brake servo controlled by the load of a vehicle which is arranged at one end of a suspension spring of the vehicle and connected to the spring by a set of cams so as to make vary the brake pressure according to the vehicle load.
  • This device has drawbacks in that it comprises a large number of parts, which makes it delicate, expensive and unreliable.
  • the object of the invention is therefore to propose a braking corrector controlled by the load of a vehicle which is of simple construction, low manufacturing costs and increased reliability.
  • the invention relates to an assembly of a suspension element and a braking corrector intended to be controlled by the load of a vehicle, the corrector comprising a body in which slides a piston forming a valve element capable of '' opening or closing a hydraulic passage between an inlet and an outlet of the corrector, the piston being connected by a connecting means to a spring means of the suspension element, characterized in that the connecting means comprises a lever mounted on the suspension element between two pivoting elements subjected to the force exerted by the suspension element and arranged so as to transmit part of said force to the lever.
  • a braking corrector controlled by the load of a vehicle comprises a corrector body 10 in which slides a piston 12 which forms a valve element in a hydraulic passage (not shown) between an inlet 14 and an outlet 16.
  • the inlet 14 is intended to be connected to a hydraulic transmitter (not shown), for example a master cylinder
  • the outlet 16 is intended to be connected to a hydraulic receiver (not shown), for example the rear wheel brakes of the vehicle.
  • the piston 12 is movable between a position opening the hydraulic passage and a position closing this passage.
  • the corrector body 10 is attached to an annular element 18 fixedly mounted on a suspension assembly 23.
  • a second annular element 24 is mounted with play around the damper 22 and has an extension 26 which cooperates with the piston 12 of the corrector.
  • the second annular element 24 is pivotally mounted on the first annular element 18 by means of two aligned rollers 28, only one of which is shown in the figure, which are received in grooves in each annular element.
  • the center of each roller 28 is located at a distance A from the longitudinal axis of the suspension assembly 20.
  • a cup-shaped annular element 30 is mounted with clearance around the damper 22 and cooperates with the second annular element 24 by means of two aligned rollers 32, only one of which is shown in the figure, which are mounted on the 'ngitudinal axis of the suspension assembly 20 in grooves in the two elements 24.30.
  • the suspension assembly 20 is intended to be mounted between a suspended part of the vehicle and the chassis of the vehicle (not shown).
  • Two rings 34 and 36 are arranged on the device, one 34 inside the second annular element and the other 36 on a flange 37 outside so as to retain the rollers 28 and 32.
  • the ring 36 can be made of elastomeric material.
  • the longitudinal axis of the corrector piston 12 is disposed at a distance B from the axis of the suspension assembly 20.
  • a force F exerted by the load of the vehicle on the annular element 30 exerts a force on the corrector piston 12. Since the distance 1, which is of the order of 5 mm, is small compared to the distance B, which in a passenger car is approximately 70 mm the force exerted on the piston 12 of the corrector is also small .
  • This arrangement makes it possible to use a current corrector as standard without modification, as well as a set of suspension of series which requires only slight modifications.
  • Some vehicles are equipped with a shock absorber spring assembly in which the shock absorber includes a sleeve of elastomeric material mounted on the rod of the shock absorber piston. With such an assembly it is desirable that the force transmitted to the corrector really reflects the suspension force. This is achieved with the braking corrector shown in Figure 2 and described below.
  • a brake corrector subject to the load of a vehicle comprises a corrector body 110 comprising a bore 112 in which is slidably mounted a piston 114 which forms, in a manner known per se, a valve element in a hydraulic passage in being an inlet 116 is a fluid outlet 118.
  • the inlet 116 is intended to be connected to a hydraulic transmitter (not shown), for example a master cylinder, and the outlet is intended to be connected to a hydraulic receiver (not shown), for example the rear wheel brakes of the vehicle.
  • the piston 114 is movable between a position opening the hydraulic passage and a position closing this passage.
  • the body of the corrector 110 is attached by screws 120 and two shells 121 to a suspension assembly 122 which comprises a shock absorber 124 and a suspension spring 126.
  • the piston 114 has a head 128 which projects outside the body of the corrector 110.
  • An element 130 in the form of a cup, is slidably mounted around the corrector body 110 and bears on the head 128 of the piston 114.
  • the element 130 comprises an annular flange 132 on which rests a spring 134 mounted on the body of the corrector 110.
  • An annular element 136 forming a lever is mounted with clearance around the damper 124 and has an extension 138 which cooperates with the element 130 in the form of a cup.
  • the annular element 136 is pivotally mounted on the damper 124 by means of two aligned rollers 140, only one of which is shown in the figure.
  • the center of each roller 140 is located at a distance A from the longitudinal axis 142 of the suspension assembly 122.
  • a second annular element 144 is slidably mounted with low clearance around the damper 124, and cooperates with the first annular element 136 by means of two aligned rollers 146, only one of which is shown in the figure, which are mounted on the longitudinal axis 142 in grooves in the two elements 136,144.
  • the rollers 146 are held in place by a raised annular edge 148 of the first annular element 136.
  • the suspension assembly 122 is intended to be mounted between a suspended part of the vehicle and the chassis thereof (not shown).
  • the device comprises a sleeve 150 of elastomeric material mounted around a rod 152 of the piston of the shock absorber 124.
  • One end 154 of the sleeve 150 is fixedly mounted on a stop 156 which, in the 'illustrated example, is integral with the vehicle chassis.
  • the axial length of the sleeve 150 is chosen so that, when the vehicle on which the device is mounted is empty, the other end 158 of the sleeve 150 does not come to bear on a cup 160 fixedly mounted on the second annular element 144.
  • the suspension assembly 122 When the vehicle is loaded, or when the vehicle suspension dampens a bump, the suspension assembly 122 is compressed axially and the end 158 of the sleeve 150 abuts against the cup 160. The compression of the suspension assembly 122 beyond this point causes compression and the suspension spring 126 and the sleeve 150.
  • the sleeve 150 has spaced circumferential grooves 162 which ensure progressive deformation of the sleeve 150, depending on the increase in load.
  • the compression of the suspension spring 126 is substantially linear as a function of the load which it undergoes, while the characteristic of the spring-sleeve assembly 126-150 can be chosen to be non-linear with the load.
  • the piston 114 of the corrector 110 therefore receives a force which, thanks to the present invention, more faithfully reflects the actual suspension force.
  • the sleeve 150 could be replaced by a spring means, for example a helical spring.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Hydraulic Control Valves For Brake Systems (AREA)
  • Vehicle Body Suspensions (AREA)
  • Fluid-Damping Devices (AREA)

Description

La présente invention se rapporte aux correcteurs de freinage, et, plus particulièrement à un tel correcteur asservi à la charge d'un véhicule, selon le preambule de la revendication 1.The present invention relates to braking correctors, and more particularly to such a corrector controlled by the load of a vehicle, according to the preamble of claim 1.

Il est souhaitable, pour des raisons d'économie de place et de nombre de pièces, de relier un correcteur de freinage directement au ressort de suspension d'un véhicule en vue de faire varier le freinage des roues du véhicule en fonction de sa charge.It is desirable, for reasons of economy of space and number of parts, to connect a braking corrector directly to the suspension spring of a vehicle in order to vary the braking of the wheels of the vehicle according to its load.

On connaît du document GB-A-1 577 029 un correcteur de freinage asservi à la charge d'un véhicule qui est disposé à une extrémité d'un ressort de suspension du véhicule et relié au ressort par un ensemble de cames de façon à faire varier la pression de freinage en fonction de la charge du véhicule. Ce dispositif présente des inconvénients en ce qu'il comprend un nombre important de pièces, ce qui le rend délicat, onéreux et peu fiable.Document GB-A-1 577 029 discloses a brake servo controlled by the load of a vehicle which is arranged at one end of a suspension spring of the vehicle and connected to the spring by a set of cams so as to make vary the brake pressure according to the vehicle load. This device has drawbacks in that it comprises a large number of parts, which makes it delicate, expensive and unreliable.

L'invention a donc pour objet de proposer un correcteur de freinage asservi à la charge d'un véhicule qui est de construction simple, de faible coûts de fabrication et de fiabilité accrue.The object of the invention is therefore to propose a braking corrector controlled by the load of a vehicle which is of simple construction, low manufacturing costs and increased reliability.

Pour ce faire, l'invention concerne un ensemble d'un élément de suspension et un correcteur de freinage destiné à être asservi à la charge d'un véhicule, le correcteur comprenant un corps dans lequel coulisse un piston formant un élément de clapet susceptible d'ouvrir ou de fermer un passage hydraulique entre une entrée et une sortie du correcteur, le piston étant relié par un moyen de liaison à un moyen de ressort de l'élément de suspension, caractérisé en ce que le moyen de liaison comprend un levier monté sur l'élément de suspension entre deux éléments de pivotement soumis à la force exercée par l'élément de suspension et disposés de façon à transmettre une partie de ladite force au levier.To do this, the invention relates to an assembly of a suspension element and a braking corrector intended to be controlled by the load of a vehicle, the corrector comprising a body in which slides a piston forming a valve element capable of '' opening or closing a hydraulic passage between an inlet and an outlet of the corrector, the piston being connected by a connecting means to a spring means of the suspension element, characterized in that the connecting means comprises a lever mounted on the suspension element between two pivoting elements subjected to the force exerted by the suspension element and arranged so as to transmit part of said force to the lever.

D'autres caractéristiques et avantages de la présente invention ressortiront de la description suivante de deux modes de réalisation donnés à titre illustratif, mais nullement limitatif, faite en relation avec les dessins annexés sur lesquels :

  • - la figure 1 est une vue schématique d'un correcteur asservi à la charge d'un véhicule, selon un premier mode de réalisation de l'invention ; et
  • - la figure 2 est une vue schématique d'un deuxième mode de réalisation du correcteur suivant l'invention.
Other characteristics and advantages of the present invention will emerge from the following description of two embodiments given by way of illustration, but in no way limiting, made in relation to the appended drawings in which:
  • - Figure 1 is a schematic view of a corrector controlled by the load of a vehicle, according to a first embodiment of the invention; and
  • - Figure 2 is a schematic view of a second embodiment of the corrector according to the invention.

Comme représenté sur la figure 1, un correcteur de freinage asservi à la charge d'un véhicule comprend un corps de correcteur 10 dans lequel coulisse un piston 12 qui forme un élément de clapet dans un passage hydraulique (non représenté) entre une entrée 14 et une sortie 16. L'entrée 14 est destinée à être reliée à un émetteur hydraulique (non représenté), par exemple un maître-cylindre, et la sortie 16 est destinée à être reliée à une récepteur hydraulique (non représenté), par exemple les freins de roues arrières du véhicule. Le piston 12 est déplaçable entre une position ouvrant le passage hydraulique et une position fermant ce passage.As shown in FIG. 1, a braking corrector controlled by the load of a vehicle comprises a corrector body 10 in which slides a piston 12 which forms a valve element in a hydraulic passage (not shown) between an inlet 14 and an outlet 16. The inlet 14 is intended to be connected to a hydraulic transmitter (not shown), for example a master cylinder, and the outlet 16 is intended to be connected to a hydraulic receiver (not shown), for example the rear wheel brakes of the vehicle. The piston 12 is movable between a position opening the hydraulic passage and a position closing this passage.

Le corps de correcteur 10 est rattaché à un élément annulaire 18 monté fixe sur un ensemble de suspension 23. Un deuxième élément annulaire 24 est monté avec jeu autour de l'amortisseur 22 et comporte une extension 26 qui coopère avec le piston 12 du correcteur. Le deuxième élément annulaire 24 est monté à pivotement sur le premier élément annulaire 18 par l'intermédiaire de deux rouleaux 28 alignés, dont un seul est représenté sur la figure, qui sont reçus dans des gorges dans chaque élément annulaire. Le centre de chaque rouleau 28 est situé à une distance A de l'axe longitudinal de l'ensemble de suspension 20.The corrector body 10 is attached to an annular element 18 fixedly mounted on a suspension assembly 23. A second annular element 24 is mounted with play around the damper 22 and has an extension 26 which cooperates with the piston 12 of the corrector. The second annular element 24 is pivotally mounted on the first annular element 18 by means of two aligned rollers 28, only one of which is shown in the figure, which are received in grooves in each annular element. The center of each roller 28 is located at a distance A from the longitudinal axis of the suspension assembly 20.

Un élément annulaire 30 en forme de coupe est monté avec jeu autour de l'amortisseur 22 et coopère avec le deuxième élément annulaire 24 par l'intermédiaire de deux rouleaux 32 alignés, dont un seul est représenté sur la figure, qui sont montés sour l'axe Io ngitudinal de l'ensemble de suspension 20 dans des gorges dans les deux éléments 24,30.A cup-shaped annular element 30 is mounted with clearance around the damper 22 and cooperates with the second annular element 24 by means of two aligned rollers 32, only one of which is shown in the figure, which are mounted on the 'ngitudinal axis of the suspension assembly 20 in grooves in the two elements 24.30.

Une extrémité du ressort de suspension 23 est reçue dans l'élément annulaire 30. L'ensemble de suspension 20 est destiné à être monté entre une partie suspendue du véhicule et le châssis du véhicule (non représenté).One end of the suspension spring 23 is received in the annular element 30. The suspension assembly 20 is intended to be mounted between a suspended part of the vehicle and the chassis of the vehicle (not shown).

Deux bagues 34 et 36 sont disposées sur le dispositif, l'une 34 à l'intérieur du deuxième élément annulaire et l'autre 36 sur une bride 37 à l'extérieur de façon à retenir les rouleaux 28 et 32. La bague 36 peut être réalisée en matériau élastomère.Two rings 34 and 36 are arranged on the device, one 34 inside the second annular element and the other 36 on a flange 37 outside so as to retain the rollers 28 and 32. The ring 36 can be made of elastomeric material.

L'axe longitudinal du piston 12 du correcteur est disposé à une distance B de l'axe de l'ensemble de suspension 20. Ainsi une force F exercée par la charge du véhicule sur l'élément annulaire 30 exerce une force

Figure imgb0001
sur le piston 12 du correcteur. Etant donné que la distance 1, qui est de l'ordre de 5mm, est faible par rapport à la distance B, qui, dans une voiture de tourisme est d'environ 70 mm la force exercée sur le piston 12 du correcteur est également faible. Cet agencement permet d'utiliser un correcteur actuel de série sans modification, ainsi qu'un ensemble de suspension de série qui nécessite que de légères modifications.The longitudinal axis of the corrector piston 12 is disposed at a distance B from the axis of the suspension assembly 20. Thus a force F exerted by the load of the vehicle on the annular element 30 exerts a force
Figure imgb0001
 on the corrector piston 12. Since the distance 1, which is of the order of 5 mm, is small compared to the distance B, which in a passenger car is approximately 70 mm the force exerted on the piston 12 of the corrector is also small . This arrangement makes it possible to use a current corrector as standard without modification, as well as a set of suspension of series which requires only slight modifications.

Certains véhicules sont équipés d'un ensemble de ressort-amortisseur dans lequel l'amortisseur comprend un manchon de matériau élastomère monté sur la tige du piston de l'amortisseur. Avec un tel ensemble il est souhaitable que la force transmise au correcteur reflète réellement l'effort de suspension. On atteint ce résultat avec le correcteur de freinage représenté sur la figure 2 et décrit à la suite.Some vehicles are equipped with a shock absorber spring assembly in which the shock absorber includes a sleeve of elastomeric material mounted on the rod of the shock absorber piston. With such an assembly it is desirable that the force transmitted to the corrector really reflects the suspension force. This is achieved with the braking corrector shown in Figure 2 and described below.

Comme représenté sur cette figure, un correcteur de freinage asservi à la charge d'un véhicule comprend un corps de correcteur 110 comportant un alésage 112 dans lequel est monté à coulissement un piston 114 qui forme, de manière connue en soi, un élément de clapet dans un passage hydraulique entre une entrée 116 est une sortie 118 de fluide. L'entrée 116 est destinée à être reliée à un émetteur hydraulique (non-représenté), par exemple un maître-cylindre, et la sortie est destinée à être reliée à un récepteur hydraulique (non représenté), par exemple les freins de roues arrières du véhicule. Le piston 114 est déplaçable entre une position ouvrant le passage hydraulique et une position fermant ce passage.As shown in this figure, a brake corrector subject to the load of a vehicle comprises a corrector body 110 comprising a bore 112 in which is slidably mounted a piston 114 which forms, in a manner known per se, a valve element in a hydraulic passage in being an inlet 116 is a fluid outlet 118. The inlet 116 is intended to be connected to a hydraulic transmitter (not shown), for example a master cylinder, and the outlet is intended to be connected to a hydraulic receiver (not shown), for example the rear wheel brakes of the vehicle. The piston 114 is movable between a position opening the hydraulic passage and a position closing this passage.

Le corps du correcteur 110 est rattaché par des vis 120 et deux coquilles 121 à un ensemble de suspension 122 qui comprend un amortisseur 124 et un ressort de suspension 126.The body of the corrector 110 is attached by screws 120 and two shells 121 to a suspension assembly 122 which comprises a shock absorber 124 and a suspension spring 126.

Le piston 114 comporte une tête 128 qui fait saillie à l'extérieur du corps du correcteur 110. Un élément 130, en forme de gobelet, est monté à coulissement autour du corps de correcteur 110 et prend appui sur la tête 128 du piston 114. L'élément 130 comporte une bride annulaire 132 sur laquelle prend appui un ressort 134 monté sur le corps du correcteur 110.The piston 114 has a head 128 which projects outside the body of the corrector 110. An element 130, in the form of a cup, is slidably mounted around the corrector body 110 and bears on the head 128 of the piston 114. The element 130 comprises an annular flange 132 on which rests a spring 134 mounted on the body of the corrector 110.

Un élément annulaire 136 formant levier est monté avec jeu autour de l'amortisseur 124 et comporte une extension 138 qui coopère avec l'élément 130 en forme de coupe. L'élément annulaire 136 est monté à pivotement sur l'amortisseur 124 par l'intermédiaire de deux rouleaux 140 alignés, dont un seul est représenté sur la figure. Le centre de chaque rouleau 140 est situé à une distance A de l'axe longitudinal 142 de l'ensemble de suspension 122.An annular element 136 forming a lever is mounted with clearance around the damper 124 and has an extension 138 which cooperates with the element 130 in the form of a cup. The annular element 136 is pivotally mounted on the damper 124 by means of two aligned rollers 140, only one of which is shown in the figure. The center of each roller 140 is located at a distance A from the longitudinal axis 142 of the suspension assembly 122.

Un deuxième élément annulaire 144 est monté à coulissement à faible jeu autour de l'amortisseur 124, et coopère avec le premier élément annulaire 136 par l'intermédiaire de deux rouleaux 146 alignés, dont un seul est représenté sur la figure, qui sont montés sur l'axe longitudinal 142 dans des gorges dans les deux éléments 136,144. Les rouleaux 146 sont retenus en place par un bord annulaire relevé 148 du premier élément annulaire 136.A second annular element 144 is slidably mounted with low clearance around the damper 124, and cooperates with the first annular element 136 by means of two aligned rollers 146, only one of which is shown in the figure, which are mounted on the longitudinal axis 142 in grooves in the two elements 136,144. The rollers 146 are held in place by a raised annular edge 148 of the first annular element 136.

Une extrémité du ressort de suspension 126 est reçue dans le deuxième élément annulaire 144. L'ensemble de suspension 122 est destiné à être monté entre une partie suspendue du véhicule et le châssis de celui-ci (non représentés).One end of the suspension spring 126 is received in the second annular element 144. The suspension assembly 122 is intended to be mounted between a suspended part of the vehicle and the chassis thereof (not shown).

Le dispositif comporte un manchon 150 en matière élastomère monté autour d'une tige 152 du piston de l'amortisseur 124. Une extrémité 154 du manchon 150, celle du haut en regardant le dessin, est montée fixe sur une butée 156 qui, dans l'exemple illustré, est solidaire du châssis du véhicule. La longueur axiale du manchon 150 est choisie de manière que, quand le véhicule sur lequel le dispositif est monté est vide, l'autre extrémité 158 du manchon 150 ne vient pas en appui sur une coupelle 160 montée fixe sur le deuxième élément annulaire 144.The device comprises a sleeve 150 of elastomeric material mounted around a rod 152 of the piston of the shock absorber 124. One end 154 of the sleeve 150, that at the top looking at the drawing, is fixedly mounted on a stop 156 which, in the 'illustrated example, is integral with the vehicle chassis. The axial length of the sleeve 150 is chosen so that, when the vehicle on which the device is mounted is empty, the other end 158 of the sleeve 150 does not come to bear on a cup 160 fixedly mounted on the second annular element 144.

Quand le véhicule est chargé, ou quand la suspension du véhicule amortit un cahot, l'ensemble de suspension 122 est comprimé axialement et l'extrémité 158 du manchon 150 vient en butée contre la coupelle 160. La compression de l'ensemble de suspension 122 au-delà de ce point entraîne la compression et du ressort de suspension 126 et du manchon 150. Le manchon 150 comporte des rainures circonférentielles espacées 162 qui assurent une déformation progressive du manchon 150, fonction de l'augmentation de la charge.When the vehicle is loaded, or when the vehicle suspension dampens a bump, the suspension assembly 122 is compressed axially and the end 158 of the sleeve 150 abuts against the cup 160. The compression of the suspension assembly 122 beyond this point causes compression and the suspension spring 126 and the sleeve 150. The sleeve 150 has spaced circumferential grooves 162 which ensure progressive deformation of the sleeve 150, depending on the increase in load.

Ainsi, quand l'ensemble de suspension 122 est comprimé au-delà d'une valeur prédéterminée, l'extrémité 158 du manchon 150 vient en butée sur la coupelle 160 et le manchon 150 exerce une force supplémentaire sur le deuxième élément annulaire 144. Cette combinaison de forces est transmise, comme dans la demande de brevet principale, par l'extension 138 au piston 114 du correcteur.Thus, when the suspension assembly 122 is compressed beyond a predetermined value, the end 158 of the sleeve 150 abuts on the cup 160 and the sleeve 150 exerts an additional force on the second annular element 144. This Combination of forces is transmitted, as in the main patent application, by the extension 138 to the piston 114 of the corrector.

La compression du ressort de suspension 126 est sensiblement linéaire en fonction de la charge qu'il subit, tandis que la caractéristique de l'ensemble ressort-manchon 126-150 peut être choisie pour être non-linéaire avec la charge.The compression of the suspension spring 126 is substantially linear as a function of the load which it undergoes, while the characteristic of the spring-sleeve assembly 126-150 can be chosen to be non-linear with the load.

Le piston 114 du correcteur 110 reçoit donc une force qui, grâce à la présente invention, reflète de manière plus fidèle l'effort réel de suspension.The piston 114 of the corrector 110 therefore receives a force which, thanks to the present invention, more faithfully reflects the actual suspension force.

Le manchon 150 pourrait être remplacé par un moyen de ressort, par exemple un ressort hélicoïdal.The sleeve 150 could be replaced by a spring means, for example a helical spring.

Claims (5)

1. Assembly consisting of a suspension element (20; 22) and of a brake corrector (10; 110) comprising a body, in which slides a piston (12; 114) forming a shutter element capable of opening or closing a hydraulic passage between an inlet (14; 116) and an outlet (16; 118) of the corrector, the piston (12; 114) being connected by a connection means to a spring means (23; 126) of the suspension element (20; 122), characterized in that the connection means comprising a lever (24; 136) mounted on the suspension element (20; 122) between two pivoting elements (28, 32; 140; 146) which are subjected to the force exerted by the suspension element (20; 122) and which are arranged so as to transmit some of the said force to the corrector.
2. Assembly according to Claim 1, characterized in that the lever (24; 136) has a substantially annular shape and is mounted about the suspension element (20; 122).
3. Assembly according to Claim 1 or 2, characterized in that the pivoting elements (28; 32; 140; 146) each comprise a roller mounted in a corresponding groove in the lever (24; 136).
4. Assembly according to one of Claims 1 to 3, characterized in that one (32; 146) of the pivoting elements is arranged in a longitudinal axis of the suspension element (20; 122).
5. Assembly according to Claim 1, characterized in that it also possesses a second spring means (150) mounted on the suspension element (122), so as to exert an additional force on the lever (136) when the suspension element (122) undergoes a force which exceeds a predetermined threshold.
EP87401938A 1986-09-18 1987-08-27 Load-sensitive brake valve for a vehicle Expired EP0262999B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8613075 1986-09-18
FR8613075A FR2604135B1 (en) 1986-09-18 1986-09-18 BRAKE CORRECTOR SERVO-LOADED BY A VEHICLE
FR8702537 1987-02-26
FR878702537A FR2611629B2 (en) 1986-09-18 1987-02-26 BRAKE CORRECTOR SERVO-LOADED BY A VEHICLE

Publications (2)

Publication Number Publication Date
EP0262999A1 EP0262999A1 (en) 1988-04-06
EP0262999B1 true EP0262999B1 (en) 1989-10-18

Family

ID=26225485

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87401938A Expired EP0262999B1 (en) 1986-09-18 1987-08-27 Load-sensitive brake valve for a vehicle

Country Status (6)

Country Link
US (1) US4828330A (en)
EP (1) EP0262999B1 (en)
JP (1) JPS6387352A (en)
DE (1) DE3760795D1 (en)
ES (1) ES2011299B3 (en)
FR (1) FR2611629B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3915221A1 (en) * 1989-05-10 1990-11-15 Teves Gmbh Alfred Dual control unit for hydraulic brakes - has lever of variable length acting via control pistons to vary input to output hydraulic pressure ratio
JPH03104760A (en) * 1989-09-19 1991-05-01 Tokico Ltd Load sensing type liquid pressure control device
FR3034711B1 (en) * 2015-04-07 2017-04-28 Peugeot Citroen Automobiles Sa ATTACK STOP SYSTEM FOR THE SUSPENSION OF A VEHICLE MEASURING THE LOAD OF THIS VEHICLE

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE689702C (en) * 1938-09-29 1940-04-01 Hessenwerk Rudolf Majert Kom G Active regulation of the brake pressure depending on the load on the vehicle
FR2387146A1 (en) * 1977-04-15 1978-11-10 Citroen Sa BRAKE PRESSURE LIMITER CONTROL ANCHORAGE FOR MOTOR VEHICLES
IT1192264B (en) * 1978-08-04 1988-03-31 Brembo Bombassei Breda PERFECT BRAKING SYSTEM FOR MOTOR VEHICLES
IN150635B (en) * 1979-01-16 1982-11-20 Lucas Industries Ltd
FR2470037A1 (en) * 1979-11-20 1981-05-29 Dba EQUIPMENT FOR A DEVICE FOR CONTROLLING A BRAKE CORRECTOR
US4423909A (en) * 1981-10-30 1984-01-03 Page W R Empty and load apparatus for railroad cars
DE3276418D1 (en) * 1982-03-16 1987-07-02 Bendix Italia Regulating brake valve
DE3329140A1 (en) * 1983-08-12 1985-02-21 FAG Kugelfischer Georg Schäfer KGaA, 8720 Schweinfurt Load-related brake pressure control device
FR2559722B1 (en) * 1984-02-22 1986-12-05 Dba VEHICLE LOAD INFLUENCE BRAKE CORRECTOR
DE3422621A1 (en) * 1984-06-19 1985-12-19 Alfred Teves Gmbh, 6000 Frankfurt BRAKE PRESSURE CONTROL UNIT
GB8518706D0 (en) * 1985-07-24 1985-08-29 Lucas Ind Plc Brake pressure reducing valve

Also Published As

Publication number Publication date
FR2611629A2 (en) 1988-09-09
DE3760795D1 (en) 1989-11-23
US4828330A (en) 1989-05-09
FR2611629B2 (en) 1989-05-19
JPS6387352A (en) 1988-04-18
EP0262999A1 (en) 1988-04-06
ES2011299B3 (en) 1990-01-01

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